package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties wechatProperties;

    @Autowired
    private UserMapper userMapper;

    public static final  String WX_Login_URL = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信登录接口，获取openid
        String openid = getOpenid(userLoginDTO.getCode());

        // 判断openid是否为空，如果为空，则抛出异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否是新用户
        User user = userMapper.getUserByOpenid(openid);

        // 如果是新用户，则自动完成注册
        if(user == null){
            user = new User().builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 返回用户信息
        return  user;
    };

    public String getOpenid(String code) {
        // 调用微信登录接口，获取openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", wechatProperties.getAppid());
        map.put("secret", wechatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_Login_URL, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }

}
